For day hikes, we have found that bagels, mountain bread or pita; sturdy fruit such as oranges and apples; and gorp, chocolate or energy bars are ideal foods that pack a lot of energy and won’t disintegrate on the trail. Many hikers pack traditional European-style lunches of bread, cheese, fruit and hard meats that don’t require much refrigeration, such as pepperoni or summer sausage. Oranges are favored by many, who claim they seem to taste better at high altitudes.